Quadra in a Backpack

Anyone on here transport their elinchrom quadra in a backpack, if so which one do you use? I'm looking for something to carry a single head system. Getting tired of carrying the battery and another bag with the head and cable. Thanks!!

I use a Tamrac Rally bag that I got free with an Olympus pen camera that I bought. It fits the battery(and pack) and the head in the main compartment (all dividers removed) and the cable in the front zipper. It's a tight fit and I usually don't use the clip to close it but it gets the job done and works great for quick access I also keep a small white/silver reflector in the front compartment (24" I think?).
My other Quadra pack stays in my camera bag and only comes out when I need more than one light which I try to avoid as much as possible when on location (outdoors).